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<h1>下面是一个选择框</h1>
<select id="s3" >
    <option value="xag0">01</option>
    <option value="xag1">python3</option>
    <option value="xag2">AirPython</option>
    <option value="xag3">PO设计模式</option>
    <option value="xag4">自动化持续集成</option>
</select>

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